how to determine the sex of the oscar?

Answer 1

ujust keep watching it

Answer 2

This will apply to only Albino Oscar. I did not verify on other types of oscars. It is easier to sex oscars when they are 3-4 inches or more. the bigger the more accurate.
Male:
the forehead is more developed, clearly defined hump, the body look longer and look more yellow instead of pinky. The orange color really depends on food and light setting. But one sure thing to look at is the anal fin ( the fin below the tail, behind the anus) You should see the inner outline or contour of this fin come to a single point like a cross between two curves. look at picture here:
http://astro.temple.edu/~khoapham/male2.JPG
Male will actively follow the female prior to spawning, and the male will try to attack the female's tail, near the spot.

Female:
Generally, female does not have big forehead, just flat or just a little curve up, not a hump. she's often squivering to get the male's attention prior to spawning, even if she doesnt lay eggs, its a sign. The body look shorter but actually not short, just because it is more rounded, and wider from side view . Most important characteristic is still the anal fin, it is round at the tip, no single defined point can be found. check picture here:
http://astro.temple.edu/~khoapham/female2.JPG

I had 4 x 30 min observations in petsmart, and also observed my 2 oscars most of my free time just to find this out because it was such a challenge for all oscar lovers and starters. I had them at 3 in and now they about 5 to 5.5 in. confirmed to be mating pair. Good luck with your oscars. and remember this applies to Albino Oscars only.

Answer 3

I have answered this question very recently, and saying here for you again...

For some species of cichlids, males and females are easy to sex just by visual differences like their color, shape, size, & fins. For others it is difficult or even impossible to tell the sexes apart. However, there are several techniques for determining a fish's gender.

The only 100% accurate way to determine gender is called 'venting' but there are some other way to 'indicate' weather you 'may' have a male or female, however this is not completely accurate but a mere guess.

You can start by looking at the anal fins. A males anal find will come to a point where as a females will be more blunt.

Males usually have more of a bright vivid color, where females are usually more of a drab color. Males tend to be bigger in size & most male cichlids develop a small hump on their head.

Venting involves removing the fish (with wet hands) and examining their dorsal side, looking for the genital pore between their anus and anal fin.

Venting can be pretty tough at first because male & female fish genatalia look the same but once you get the hang of it, it becomes much more easy. Me Keep in mind though that when cichlids are young it will be harder to vent. When they get to be about 4" to 5" it is much easier.

To vent some people take the fish right out of the water to look but I suggest leaving that to the experts since it is very stressful on the fish. You can quite easily take a peek when the fish is at the top of the tank. A little trick is to feed them & then crouch down to peek.

Now, the vent (gender) is the part you will be looking at to determine the sex. This is located in between the anal fin & anus. When the female is mature you will see her vent tube (egg tube) which is usually clear, will drop & be visible.

Answer 4

What Mantra says is all true,however it's not all cut and dried as it sounds. The spawning tubes of the fish are really only easy to see when they are spawning,then identification is easy.The males tube will be smaller,and come to a sharp point,the females will be larger and slightly blunt. I've known real fish professionals that couldn't sex Oscars until they spawned. Be patient and prepared to by lots of fish before getting just the right pair. It can be exasperating.---Good luck.----PeeTee